- first quantum number
- first quarter
- first quartile
- first reading
- first refusal
- first responder
- first run
- first school
- first sergeant
- first strike
- first string
- first thing
- first things first
- first water
- first world problem
- first-born
- first-cause argument
- first-class
- first-come
- first-day cover
- first-degree
- first-degree burn
- first-dollar coverage
- first-foot
- first-generation
- first-hand
- first-in, first-out
- first-line
- first-loss policy
- first-name
- first-nighter
- first-order
- first-past-the-post
- first-person shooter
- first-rate
- first-sale doctrine
- first-strike
- first-string
- first-termer
- first-time
- first-timer
- firstborn
- firstcomer
- firsthand
- firstling
- firstly
- firstnighter
- firsts
- firth
- fisc
- fiscal
- fiscal agent
- fiscal cliff
- fiscal drag
- fiscal policy
- fiscal year
- fiscally
- fish
- fish and brewis
- fish and chips
- fish cake
- fish crow
- fish culture
- fish doctor
- fish duck
- fish eagle
- fish farm
- fish flake
- fish flour
- fish for
- fish fork
- fish fry
- fish geranium
- fish hatchery
- fish hawk
- fish in troubled waters
- fish joint
- fish knife
- fish ladder
- fish louse
- fish meal
- fish or cut bait
- fish out
- fish out of water, a
- fish pole
- fish protein concentrate
- fish sauce
- fish slice
- fish stick
- fish story
- fish tackle
- fish tail
- fish tank
- fish warden
- fish-and-chip shop
- fish-bellied
- fish-hook
- fishable
- fishbolt
- fishbone fern
- fishbowl
- fishcake
- fisher
- fisherman
- fisherman's bend
- fisherman's knot
- fisherman's ring
- fisherwoman
- fishery
- fishes
- fisheye
- fisheye lens
- fishfinger
- fishfly
- fishgig
- fishhook
- fishhook cactus
- fishing
- fishing banks
- fishing expedition
- fishing ground
- fishing pole
- fishing rod
- fishing smack
- fishing tackle
- fishing trip
- fishing worm
- fishkill
- fishline
- fishmeal
- fishmonger
- fishnet
- fishplate
- fishpond
- fishpound
- fishskin
- fishskin disease
- fishtail
- fishway
- fishwife
- fishworm
- fishy
- fisk
- fissi-
- fissile
- fission
- fission bomb
- fission product
- fission reactor
- fission track
- fission, nuclear
- fission-fusion bomb
- fission-track dating
- fissionable
- fissipalmate
- fissiparous
- fissiped
- fissirostral
- fissure
- fissure eruption
- fissure of Rolando
- fissure of Sylvius
- fist
- fist bump
- fist pump
- fistfight
- fistful
- fistiana
- fistic
- fisticuff
- fisticuffs
- fistmele
- fistnote
- fistula
- fistulize
- fistulous
- fit
- fit as a fiddle
- fit in
- fit like a glove
- fit note
- fit out
- fit to be tied
- fit to kill
- fit up
- fitch
- fitchew
- fitful
- fitly
- fitment
- fitna
- fitness
- fitness tracker
- fits and starts
- fits and starts, by
- fitspiration
- fitspo
- fitted
- fitten
- fitter
- fitting
- fitting room
- fittonia
- five
- five Ks
- five W's
- five by five
- five hole
- five hundred
- five hundred rummy
- five o'clock shadow
- five senses
- five stones
- five-a-side
- five-and-ten
- five-by-five
- five-eighth
- five-faced bishop
- five-finger
- five-gaited
- five-legged
- five-o'clock shadow
- five-speed
- five-spice powder
- five-spot
- five-star
- fivefold
- fivepenny
- fivepins
- fiver
- fives
- fix
- fix someone's wagon
- fix up
- fix-it
- fix-up
- fixate
- fixated
- fixation
- fixative
- fixator
- fixed
- fixed action pattern
- fixed asset
- fixed assets
- fixed bridge
- fixed capital
- fixed charge
- fixed cost
- fixed costs
- fixed exchange rate
- fixed head
- fixed idea
- fixed liability
- fixed link
- fixed oil
- fixed point
- fixed price
- fixed satellite
- fixed sign
- fixed star
- fixed trust
- fixed-do system
- fixed-focus camera
- fixed-gear
- fixed-head coupé
- fixed-income
- fixed-length
- fixed-point representation
- fixed-rate mortgage
- fixed-wing
- fixer
- fixer-upper
- fixie
- fixing
- fixings
- fixity
- fixt
- fixture
- fizgig
- fizz
- fizzer
- fizzle
- fizzle out
- fizzwater
- fizzy
- fj
- fjeld
- fjord
- fk
- fl
- fl oz
- fl.
- fl. dr.
- fl. oz.
- flab
- flabbergast
- flabbergasted
- flabby
- flabellate